Self-tightening rock-drill chuck.



No. 871,972. PATENTED NOV. 26, 1907. J. A. THOMPSON, E. M. MAOKIB & P.P. DOYLE.

SELF TIGHTENING RDGK DRILL CHUCK.

APPLICATION FILED FEB- 6. 19 07.

2 SHEETS-SHEET l.

Swum tow.

No. 871,972. PATENTBD NOV. 26, 1907. J. A. THOMPSON, E. M. MACKIB & P.P. DOYLE.

SELF TIGHTENING ROCK DRILL CHUCK.

APPLICATION FILED FEB. 6. 1907.

2 SHEETS-SHEET 2.

THE mama's PETERS co. wunmpnm, o. r:

UNITED STATES PATENT OFFICE.

JAMES A. THOMPSON, EDWIN M. MACKIE, AND PERCIVAL F. DOYLE, OF CHICAGO,ILLI- NOIS, ASSIGNORS TO CHICAGO PNEUMATIC TOOL COMPANY, A CORPORATIONOF NE\V JERSEY.

SELF-TIGHTENING ROCK-DRILL CHUCK.

No. 871,972. Specification of Letters Patent.

Application filed February 6. 1907. Serial No. 356,020.

Patented Nov. 26, 1907.

T 0 all whom it may concern:

Be it known that we, JAMES A. Tnonrson and EDWIN M. MAoKIE, citizens ofthe United States, and PERGIVAL F. DOYLE, a subject of the King of GreatBritain, all residing in the city of Chicago, county of Cook, State ofIllinois, have invented a new and useful Self-Tightening Rock-DrillChuck, of which-the following is a specification.

In a co-pending application, filed January 21st, 1907, Serial No.353,282, we have described and broadly claimed a novel construction ofself-tightening rock-drill chuck consisting of a novel construction ofpiston rod, chuck bushing, drill steel, chuck key, keying ring andspring clip stop and their adjuncts which are constructed and assembledin a novel manner in order that the drill steel will be held in thechuck under all conditions, irrespective of all working conditions towhich the device may be subjected and whereby the labor and timeessential to re place the drill is reduced to a minimum.

Our present invention while embodying some of the novel features of theabove mentioned application has for its object more particularly theproduction of a novel construction of a drill chuck in Which the bushingmay be more readily renewed and novel means for retaining this bushingin assembled position.

It further consists of a novel construction of a drill chuck providedwith a slotted face into which our novel construction of chuck bushingmay be readily inserted and novel means for alining the bushing withrespect to the chuck.

It further consists of a novel construction of a chuck key which isadapted to co-act with locking means independent of the chuck and ringto prevent any improper movement of the chuck bushing and its adjunctswhen the parts are in assembled position.

It further consists of a novel construction and arrangement of theco-acting parts and other novel features of construction, all as will behereinafter fully set forth.

For the purpose of illustrating our invention, we have shown one form ofa device as this embodiment best illustrates the principle of ourinvention, although it is obvious that the principal instrumentalitiesof which our invention consists can be variously arranged and organizedand in the accompanying drawings, we have shown one embodiment thereofwhich we have found in practice to give satisfactory and reliableresults, although it is to be understood that our invention is notlimited to this specific arrangement and organization of theseinstrumentalities.

Figure 1 represents a side elevation of a self-tightening rock-drillchuck embodying our invention. Fig. 2 represents a sectional view of ournovel chuck, the section being taken on line 9c0c, Fig. 3. Fig. 3represents a section on line yy, Fig. 2.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings :1 designates a chuck body, which is providedon its face with a chamber or slot 2 into which a chuck bushing 3 isadapted to be inserted, it being noted that in the present instance,this chuck bushing instead of being driven into an aperture in the endof the chuck is simply slipped into the chuck body from its upper face.

The chuck bushing 3 is provided with a tongue or lug 4, which engages aslot or aperture 5 in the chuck body 1, so that any improper movement ofthe same will be revented when the chuck is being dissemb ed.

6 designates an aperture through the end of the chuck body 1 whichcommunicates with the chamber 2 therein, said aperture 6 being adaptedto form a bearing for a drill steel 7, which passes through the bushing3 and has a hearing at its inner end in a recess or chamber 8 in thechuck body 1. The chuck bushing 3 in the present instance is larger thanthe diameter of the aperture 6, so that any longitudinal movement ofsaid bushing will positively be prevented;

9 designates a slot or key Way in the chuck bushing 3, it being notedthat the chuck bushing opposite the slot 9 is relieved as seen at 10 inorder to form bearings 11 and 12 for the drill steel.

13 designates the chuck key which is adapted to fit the slot 2 in thechuck body 1. The inner face of said key is slightly concaved or of sucha contour as to closely fit the drill steel 7 and the bearing of saidchuck key 13 on the drill steel 7 is relieved as indicated at 1 1 inorder to form bearings 15 and 16.

Owing to the manner in which the chuck key is relieved and the fact thatthis relieved part is opposite the relieved portion 10 in the chuckbushing 3, an elastic grip is provided when the parts arein assembledposition, as will be readily understood by those skilled in the art towhich this invention appertains.

The chuck key '13 is cut away at each end as seen at 17 in order toprevent the key engaging the chuck bushing 3 and it is also recessed asindicated at 18.

19 designates slots or grooves in the sides of the chamber 2 adjacentthe bearings 11 and 12 of the chuck bushing 3.

2O designate spring clips which as most clearly seen in Fig. 3 areadapted to partially surround the chuck bushing 3 owing to the provisionof the slots or apertures 19. One end of the spring clips 20 isdeflected as indicated at 21 in Fig. 3 and this end is adapted to engagethe apertures 22 in the chuck body 1. The upper face of the chuck key 13is tapered as indicated at 23 and this tapered portion is adapted tocoact with the tapered slot 24 in the keying ring 25, which surroundsthe chuck body 1.

26 designates a spring clip which engages grooves 27 on the forward endof the chuck body 1 and owing to the provision of this clip, the keyingring 25 is prevented from slipping off the chuck body 1 when the chuckkey 13 has been removed, and it will further be seen that in case itbecomes necessary to remove the keying ring 25 from the machine forrepairs or other purposes, it will not be necessary to remove the chuck1 from the machine, since by forcing off the spring clip 26, the chuckkey 13 having been first removed, a new keying ring such as 25 may bereadily placed in position without dismantling or stopping of the drillfor any material length of time.

One face of the chuck body 1 is faced off as most clearly seen at 28, inFigs. 1 and 3. In practice the chuck body is suitably hardened in orderto prevent the undue wear of the drill steel 7 in the apertures orbearings 6 and 8.

vThe operation of assembling and dismantling the rock-drill chuck willbe readily apparent from the drawings.

The chuck bushing 3 is placed in the aperture so that the tongue 1 ofthe chuck bushing engages the aperture 5 in the chuck body 1. The springclips 20 are forced or sprung into position, the deflected ends 21thereof engaging the apertures 22 in the chuck body. The keying ring 25is moved towards the drill and the chuck key 13 is placed in position,after which the keying ring is moved towards the working tool.

It will now be apparent, owing to the construction of the tapered slot24 with which the tapered key 23 coacts, that when the machine is causedto strike a blow the momentum of the keying ring 25 will force the samemore tightly on the tapered chuck key 13 and each succeeding blow willhold the grip, as is evident. The keying ring 25 may readily be removedby striking it a blow on its large end and in practice a suitable sethammer is provided which'is adapted to be held against the keying ringto prevent the same from being injured in unkeying.

It will further be apparent that owing to the novel manner in which ournovel construction of chuck bushing is assembled with respect to thepiston rod or chuck, that the same may be readily removed whenever it isdeemed necessary without removing the chuck from the machine.Furthermore when the chuck key 13 has been removed the chuck bushingwill be maintained in position, owing to the employment of the resilientmembers 20 which co-act therewith and with the chuck body 1.

It will be apparent to those skilled in this art that when aconstruction embodying our invention is employed there is no necessityof weakening the chuck bushing in any manner in order to provide for theremoval of the same, thereby greatly prolonging the life of the chuckbushing.

It will now be apparent from the foregoing that we have devised a'noveland'useful construction of self-tightening rock-drill chuck whichembodies the features of advantage enumerated as desirable in thestatement of invention and the above description and while we have, inthe present instance, shown and described an embodiment thereof whichhas been found in practice to give satisfactory and reliable results, itis to be under stood that our invention is susceptible of modificationin various particulars without departing from the spirit and scope ofthe invention or sacrificing any of its advantages.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent, is

1. In a device of the character described, the combination of a chuckbody having its side face apertured intermediate its ends, a bushingtherefor, provided with a slot and adapted to be laterally inserted insaid aperture, a chuck key engaging said aperture and slot, and means coacting with said chuck body and chuck key for maintaining the parts inassembled position. I

2. In a device of the character described, the combination of a chuckbody having an apertured face, a bushing therefor having an innerrelieved portion intermediate its ends and a slot opposite said relievedportion, said bushing being adapted to be laterally inserted in saidaperture, a chuck key in said slot and aperture, and means engaging saidchuck body and chuck key for maintaining the parts in assembledcondition.

3. In a device of the character described, the combination of a chuckbody having an apertured face, a bushing therefor adapted to belaterally inserted. in said aperture and having an inner relievedportion intermediate its ends and a slot opposite said relieved portion,achuck key having an inclined top engaging said slot and aperture, andmeans engaging said chuck body and chuck key for retaining the parts inassembled condition.

4. In a device of the character described, the combination of a chuckbody having an apertured face, a bushing therefor, adapted to belaterally inserted in said aperture and having an inner relieved portionintermediate its ends and a slot opposite said relieved portion, a chuckkey having an inclined top engaging said slot, means for preventingrelative lateral movement of said bushing and said chuck body, and meansengaging said chuck body and chuck key for retaining the parts inassembled condition.

5. In a self-tightening rock-drill chuck, the combination of a chuckbody having an apertured face, a bushing therefor having an innerrelieved portion intermediate its ends, and, a slot opposite saidrelieved portion, means for resiliently securing said bushing in saidaperture, a chuck key engaging said slot and aperture and having aninclined top, a device engaging said chuck body and chuck key tomaintain the parts in assembled condition, and means for limiting theforward movement of said device when the chuck key is removed.

6. In a self-tightening rock-drill chuck, the combination with a chuckbody having an apertnred face, of a chuck body bushing having a lugthereon, said chuck body having a recess therein with which said lugengages, saidbushing having an inner relieved portion intermediate itsends and a slot opposite said relieved portion, a chuck key engagingsaid aperture and. said slot, and provided with an inclined top, and akeying ring engaging said chuck body and chuck key for retaining theparts in assembled condition, said ring having an inclined slot withwhich the inclined top of said key co-acts.

7. In a self-tightening rock-drill chuck, the combination of a chuckbody having an apertnred face, a chuck bushing therefor having an innerrelieved portion intermediate its ends and a slot opposite said relievedportion and adapted to be seated in said aperture, there being groovesin said chuck body, resilient means engaging said bushing and saidgrooves to maintain said bushing in assembled condition, a chuck keyhaving an inclined top engaging said aperture and said slot, and akeying ring engaging said top and said chuck body.

8. In a self-tightening rock-drill chuck, the combination of a chuckbody having an apertured face, a chuck bushing therefor having an innerrelieved portion intermediate its ends and a slot opposite said relievedportion and adapted to be seated in said aperture, resilient meansengaging said bushing and said chuck body to maintain said bushing inassembled condition, a chuck key hav ing an inclined top engaging saidaperture and said slot,-and a keying ring engaging said top and saidchuck body.

9. In a self-tightening rock-drill chuck, the combination of a chuckbody having one face apertured intermediate its ends, a bush. ing seatedin said aperture and having an inner relieved portion intermediate itsends and a slot opposite said relieved portion, there being an aperturein the end of the chuck body registering with said bushing,

said aperture and said bushing being adapted to receive a drill steel, achuck key within said slot and aperture adapted to bear on said drillsteel, and means engaging said chuck key for automatically increasingthe strength of the grip during the operation.

10. In a self-tightening rock-drill chuck, the combination of a chuckbody having an apertured face, a chuck bushing adapted to be seated insaid aperture and having an in ner relieved portion intermediate itsends, and a slot opposite said relieved portion, there being an aperturethrough the end of said chuck body registering with said bushing, saidaperture and said. bushing being adapted to receive a drill steel, theinner end of said chuck body being recessed contiguous the bushing toform a bearing for the inner end of said drill steel, yielding means fornormally maintaining said bushing in assembled position, a chuck keywithin said aperture and slot adapted to engage said drill steel, and akeying ring engaging said chuck body and chuck key.

11. In a self-tightening rock-drill chuck, the combination of a chuckbody having an apertured face, a chuckhushing seated in said apertureand having an inner relieved portion intermediate its ends, a slotopposite said relieved. portion and. an outwardly ex tending lug, therebeing a recess in said chuck body with which said lug engages, therebeing an aperture in the end of said chuck body registering with saidbushing, said aperture and said bushing being adapted to receive a drillsteel, a chuck key within said aperture and slot adapted. to engage saiddrill steel, the upper face of said key being inclined, and a keyingring having an inclined slot with which the inclined. face of said keyco-acts to maintain the parts in assembled condition.

12. In. a sel'l"-tightening rock-drill chuck, the combination of a chuckbody having an apertured face, said aperture terminating intermediatethe ends of said chuck body a chuck bushing seated in said aperture andhaving an inner relieved portion intermediate its ends, a slot oppositesaid relieved portion and an outwardly extending lug,

ing an inclined slot with which the inclinedface of said key co-acts tomaintain the'parts in assembled condition.

13. In aself-tightening rock-drill chuck, the combination of a chuckbody having an apertured face, a chuck bushing therefor having an innerrelieved portion interme diate its ends and a slot opposite saidrelieved portion and adapted to be seated in said aperture, resilientmeans engaging said bushing and said body to maintain said parts inassembled condition, a chuck key aving an inclined top engaging saidaperture and said slot, a keying ring engaging said top and said chuckbody for retaining a drill steel within said bushing, and a spring stopcarried by said chuck body adapted to co-act with said keying ring tolimit the movement thereof.

14. In a self-tightening rock-drill chuck, the combination of a chuckbody having an apertured face and a recess contiguous said aperture, achuck bushing seated in said aperture, the inner face of which isrelieved in termediate its ends to form a plurality of bearings andhaving a slot opposite said relieved portion, there being an aperture inthe forward end of said chuck body registering with said bushing and anaperture in the inner end of said chuck body contiguous said bushingforming bearings, said bearings being adapted to receive a drill steel,means for reventing the rotation of said bushing,

resi ient means for maintaining said bushing in its aperture, a chuckkey having an inclined top and adapted to engage said drill steel, and akeying ring engaging said chuck key for retaining the parts in assembledcondition, said ring having an inclined slot with which the inclined topof said key coacts;

15. I11 a device of the character described,

the combination of a chuck body having an apertured side face, a bushingadapted to be seated in said aperture and having a slot, said chuck bodyhaving an aperture in the end thereof registering with sald bushing andhaving a different diameter than the outside diameter of said bushing, akey engaging the said bushing registers, resilient means for retamingsaid bushing 1n pos1t1on, a chuck key engaging the slot in said bushing,and means co-acting with said key and chuck body for maintaining theparts in assembled condition.

17. In a device of the character described, the combination of a chuckbody having an apertured side face, a bushing adapted to be seated insaid aperture and having'a slot, said chuck body having an aperture inthe end thereof registering with said bushing and having a differentdiameter than the outside diameter of said bushing, a key engaging theaperture of said bushing, means co-acting with said chuck body and keyfor maintaining the parts in assembled condition, and a spring retainingdevice for said means.

18. In a device of the character described, the combination of a chuckbody having an apertured side and an a ertured end communicatingtherewith, a ushing adapted to be seated in said apertured side andhaving a greater outside diameter than said apertured end, said bushinghaving a slot intermediate the ends thereof, yielding means forretaining said bushing in place, a chuck key in the slot of saidbushing, and a sliding sleeve engaging said key.

JAMES A. THOMPSON. EDI/VIN M. MAOKIE. PEROIVAL F. DOYLE.

Witnesses THOMAS ROLLANDS, LEON MENNIER.

